I wanna make more of myaccounts in the internet secure with two factor. I don't know much about it, but found out about Fido 2 and so. The security key my webbrowser shows often is the one from Yubico (BTW, I would like to get one that works with Linux, with USB and for phone with NFC) I got concerned when I noticed that Yubico is from USA, (??) Because I think NSA and thibgs like five eyes and so. Is there actually a risk that the for example is made an backdoor in the key?
They're not entirely un-auditable, either. A security flaw was discovered in the Yubikey 5 in one of the IC modules from a supplier, and they patched all of their keys from that point forward.
Unfortunately, all the 5's from before May 2024 are unpatchable (by design to prevent thieves from having an easy way into the key), but any key purchased now should be fine.
I mean it's very complex and very expensive for "just" a key but if you want something fully auditable maybe Precursor.dev is a good fit. It's more than a key but the point is that it's as open as it can be. Honestly I'd consider it more a learning adventure that an tool at this point but still, see https://www.bunniestudios.com/blog/2022/towards-a-more-open-secure-element-chip/ for the philosophy and https://github.com/betrusted-io/xous-core with Vault for the key aspect specifically.
FYI: the people in here recommending the open source competitors for Yubico aren't mentioning one thing: YubiKeys, being proprietary, support a proprietary protocol called Yubico OTP in addition to the FIDO authentication protocol that the open source competitors can do.
The reason this matters is that some applications, like the Linux Bitwarden desktop app (there are others, but this is one that I've had to deal with), don't support FIDO authentication, but do support Yubico OTP. This means that, for those apps, the open source keys wouldn't be a valid authentication method.
Granted, the number of applications like this are small, and probably grows smaller by the day, but it's an important distinction to be aware of.
I have now looked into Nitrokey, and I'm convinced that I will get me one of these. I would use it to log in to my pc, which has Fedora 40.I do I understand it right, that i f I follow the steps in the following link, I can use it to log into my PC?
Yubikeys are defenetly the most popular ones, but I prefer Nitrokey which is based in Germany and open-source. I have 3 Nitrokeys and I'm very happy with them.